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\n Synopsis
		sfhwt3d < Fv.rsf > Fw.rsf verb=n forceray=n scaleray=1. xsou=sf_o(ax) + sf_n(ax)*sf_d(ax)/2 ysou=sf_o(ay) + sf_n(ay)*sf_d(ay)/2 zsou=sf_o(az) + sf_n(az)*sf_d(az)/2 nt=100 ot=0 dt=0.001 ng=360 og=-180 dg=1 nh=360 oh=-180 dh=1

* 3-D Huygens wavefront tracing traveltimes
\n* pcs 2005
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\n Parameters
		\n \n \n \n   float dg=1 \t \n \n \n\n \n \n \n   float dh=1 \t \n \n \n\n \n \n \n   float dt=0.001 \t \n \n \n\n \n \n \n   bool forceray=n [y/n] \t \n \n \n\n \n \n \n   int ng=360 \t \n \n \n\n \n \n \n   int nh=360 \t \n \n \n\n \n \n \n   int nt=100 \t \n \n \n\n \n \n \n   float og=-180 \t \n \n \n\n \n \n \n   float oh=-180 \t \n \n \n\n \n \n \n   float ot=0 \t \n \n \n\n \n \n \n   int scaleray=1. \tvelocity file \n \n \n\n \n \n \n   bool verb=n [y/n] \t \n \n \n\n \n \n \n   float xsou=sf_o(ax) + sf_n(ax)*sf_d(ax)/2 \t \n \n \n\n \n \n \n   float ysou=sf_o(ay) + sf_n(ay)*sf_d(ay)/2 \t \n \n \n\n \n \n \n   float zsou=sf_o(az) + sf_n(az)*sf_d(az)/2 \t \n \n \n

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